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Revision 1.3 / (download) - annotate - [select for diffs], Wed May 1 12:54:27 2024 UTC (5 weeks, 5 days ago) by mpi
Branch: MAIN
CVS Tags: HEAD
Changes since 1.2: +48 -0 lines
Diff to previous 1.2 (colored)
Add per-CPU caches to the pmemrange allocator. The caches are used primarily to reduce contention on uvm_lock_fpageq() during concurrent page faults. For the moment only uvm_pagealloc() tries to get a page from the current CPU's cache. So on some architectures the caches are also used by the pmap layer. Each cache is composed of two magazines, design is borrowed from jeff bonwick vmem's paper and the implementation is similar to the one of pool_cache from dlg@. However there is no depot layer and magazines are refilled directly by the pmemrange allocator. This version includes splvm()/splx() dances because the buffer cache flips buffers in interrupt context. So we have to prevent recursive accesses to per-CPU magazines. Tested by naddy@, solene@, krw@, robert@, claudio@ and Laurence Tratt. ok claudio@, kettenis@
Revision 1.2 / (download) - annotate - [select for diffs], Fri Apr 19 10:22:51 2024 UTC (7 weeks, 3 days ago) by mpi
Branch: MAIN
Changes since 1.1: +0 -48 lines
Diff to previous 1.1 (colored)
Revert per-CPU caches a double-free has been found by naddy@.
Revision 1.1 / (download) - annotate - [select for diffs], Wed Apr 17 13:12:58 2024 UTC (7 weeks, 5 days ago) by mpi
Branch: MAIN
Add per-CPU caches to the pmemrange allocator. The caches are used primarily to reduce contention on uvm_lock_fpageq() during concurrent page faults. For the moment only uvm_pagealloc() tries to get a page from the current CPU's cache. So on some architectures the caches are also used by the pmap layer. Each cache is composed of two magazines, design is borrowed from jeff bonwick vmem's paper and the implementation is similar to the one of pool_cache from dlg@. However there is no depot layer and magazines are refilled directly by the pmemrange allocator. Tested by robert@, claudio@ and Laurence Tratt. ok kettenis@